That’s the point, it’s not related. What you read is(vaguely) the definition of temperature. It’s just a physical property that determines what would happen when two bodies touch each other. If they are at “different temperatures”, some process(which we can call heat transfer) would take place from one body to the other. If the two objects have the same number assigned to them(ie, their temperature) then there will be no interaction or process that occurs. Temperature, by definition is not a measure of internal energy but it IS related to it. That relation is either directly proportional, or inversely proportional, depending on which convention you take. Humans chose the one where hot objects have a bigger number, and so we chose the relation of temperature being directly proportional to kinetic energy